embed.rs's OrtEmbedder now delegates its tokenize -> tensor build ->
mean-pool -> L2-normalize pipeline to bread_onnx::embedding::EmbeddingSession
(near-byte-identical to breadarrd's own OrtEmbedder — same duplication, now
shared, path dependency for now, see the TODO in breadmill/Cargo.toml), and
its per-EP session builders (npu_session/rocm_session/cuda_session/
openvino_session) collapse into a single to_provider() mapping onto
bread_onnx::Provider, which this crate's own breadmill/src/session.rs
counterpart now handles generically. This crate's Backend enum, cargo
feature gates (npu/rocm/cuda/openvino/full - unchanged, still control which
onnxruntime EPs actually link/load), and NPU vaip_config.json discovery all
stay local since they're genuinely breadsearch-specific. main.rs's Backend
construction and CLI flag handling are untouched.
This is also the reference implementation the MIGraphX-not-ROCm default in
bread-onnx's provider module was promoted from (see this machine's own
breadsearch-gpu-backends operator notes) — breadpad's ONNX migration, which
had the actual silent-fallback bug, follows in a later commit.
download_if_missing is replaced with bread_onnx::download::ensure_file
(same sync/ureq approach, now shared with breadarrd's downloader).
Builds clean with default features AND --features full (npu+rocm+cuda+
openvino all compiling together, matching how this crate already combined
them). All existing tests pass across the whole workspace.
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